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NCERT Solutions for Class 7th Science Chapter 12 : Reproduction in Plants

CBSE NCERT Solutions for Class 7th Science Chapter 12 : Reproduction in Plants . NCERT Class 7 Science Solutions for Chapter 12. Class VII Science Solutions NCERT


NCERT Solutions for Class 7th Science Chapter 12 : Reproduction in Plants

Page No: 141

Exercises

1. Fill in the blanks:
(a) Production of new individuals from the vegetative part of parent is called _____________.
(b) A flower may have either male or female reproductive parts. Such a flower is called_____________.
(c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as _____________.
(d) The fusion of male and female gametes is termed as _____________.
(e) Seed dispersal takes place by means of _____________, _____________ and _____________.

Answer

(a) Production of new individuals from the vegetative part of parent is called vegetative propagation.

(b) A flower may have either male or female reproductive parts. Such a flower is called unisexual.

(c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as pollination.

(d) The fusion of male and female gametes is termed asfertilisation.

(e) Seed dispersal takes place by means of wind, water andanimals.

2. Describe the different methods of asexual reproduction. Give examples.

Answer

Different methods of asexual reproduction:
(i) Vegetative propagation: In this asexual reproduction, new plants are produced from roots, stems, leaves and buds of individual plant. Examples: Stem cutting cutting in champa, eye growth in potatoes, bud in case of bryophyllum etc.

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(ii) Budding: The bud is a small projection which gradually grows and gets detached from the parent cell and
forms a new yeast cell. The new yeast cell grows, matures and produces more yeast cells. example: Yeast.

(iii) Fragmentation: In this mode of reproduction, the growth and multiplication is done by rapidly breaking down into two or more fragments. Each pieces grow into new individuals whenwater and nutrients are available. Example: Algae

(iv) Spore Formation: This reproduction is done by spores which under favourable condition germinates and develops into a new individual. Examples: Moss and ferns.

3. Explain what you understand by sexual reproduction.

Answer

The mode of reproduction in which two parents are involved for the production of new generation. the reproduction is done by male and female gametes. The stigma contain the male parts in which pollen grains are formed and pistil consists of stigma, style and ovary which contains the female parts. Most of the plants reproduce sexually with the help of flowers and seeds.

4. State the main difference between asexual and sexual reproduction.

Answer

Asexual Reproduction Sexual reproduction
(i) One parent is involved. (i) Two parents are involved.
(ii) New generation is identical or true copy of their parent. (ii) New born are similar to their parents.
(iii) It doesn’t require the formation of gametes. (iii) It requires the formation of gametes.
(iv) Special organs for reproduction are not required. (iv) Special organs for reproduction are required.
(v) Examples: Potato, Jasmine, Rose, Yeast, Bryophyllum etc. (v) Examples: Mangoes, coconut, Hibiscus etc.

5. Sketch the reproductive parts of a flower.

Answer

http://4.bp.blogspot.com/-IiYueVclIuA/Vdy6JFu-rtI/AAAAAAAAAGM/bmdZWr9vpMI/s400/reproductive%2Bparts%2Bof%2Bplants-ncert-class7-science.JPG

6. Explain the difference between self-pollination and cross-pollination.
Answer

Self pollination Cross Pollination
(i) Transfer of pollen from the stamen to the pistil of the same flower. (i) Transfer of pollen from the stamen of one flower to the pistil of another flower of the same plant or different plants of the same kind.
(ii) External medium is not required. (ii) External medium is required.
(iii) It occurs only in bisexual flower. (iii) It occurs in both unisexual and bisexual flowers.
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7. How does the process of fertilisation take place in flowers?

Answer

when pollen grain landed on the stigma of the suitable flower, it makes a tiny through style to the ovary. The pollen grain carries male gamete which met the female gamete in the ovule and fertilsation takes in flowers. The cell which results after fusion of the gametes is called a zygote which further develops into embryo.

http://3.bp.blogspot.com/-Soau0gtPcng/VdzKhhFYaFI/AAAAAAAAAGc/vHmSQI6ufJA/s1600/fertilization-in-flower-class-7ncert-science.JPG
8. Describe the various ways by which seeds are dispersed.

Answer

Various ways by which seeds are dispersed are:
(i) Dispersal by wind: Light seeds or hairy seeds and hairy fruit get blown off with the wind to far away places. Examples: Sunflower, maple, drumsticks etc.

(ii) Dispersal by water: Fruits or seeds which develop floating ability in the form of spongy or fibrous
outer coat are carried away with to different places. Example: Coconut.

(iii) Dispersal by animals or birds: Spiny seeds with hooks which get attached to the bodies of animals and
are carried to distant places. Also, the fruits are eaten up by animals and birds and their seeds get dispersed to far away places. Examples: Xanthium, Urena, Mango etc.

(iv)  Dispersal by bursting: Some seeds are dispersed when the fruits burst with sudden jerks and the seeds
are scattered far from the parent plant. Examples: castor and balsam.

(v) Dispersal by human being: They also play an important role in seed dispersal especially during plantation and farming. They also transport fruits which also help in the dispersal of seeds.

9. Match items in Column I with those in Column II:

Column I Column II
(a) Bud (i) Maple
(b) Eyes (ii) Spirogyra
(c) Fragmentation (iii) Yeast
(d) Wings (iv) Bread mould
(e) Spores (v) Potato
(vi) Rose
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Answer

Column I Column II
(a) Bud (iii) Yeast
(b) Eyes (ii) Potato
(c) Fragmentation (v) Spirogyra
(d) Wings (i) Maple
(e) Spores (iv) Bread mould

10. Tick (✓) the correct answer:

(a) The reproductive part of a plant is the
(i) leaf            (ii) stem          (iii) root         (iv) flower
 (iv) flower

(b) The process of fusion of the male and the female gametes is called
(i) fertilisation          (ii) pollination            (iii) reproduction           (iv) seed formation
 (i) fertilisation

Page No: 142

(c) Mature ovary forms the
(i) seed            (ii) stamen         (iii) pistil          (iv) fruit
 (iv) fruit

(d) A spore producing plant is
(i) rose          (ii) bread mould           (iii) potato         (iv) ginger
 (ii) bread mould

(e) Bryophyllum can reproduce by its
(i) stem         (ii) leaves          (iii) roots          (iv) flower
 (ii) leaves

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